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Byju's Answer
Standard IV
Mathematics
Subtraction
Match the sum...
Question
Match the sum or difference on the left to its best estimate on the right.
A
130
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B
40
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C
50
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D
30
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Solution
We find the nearest multiples of 10 of the numbers involved to find the best estimates of the sums or differences given.
61
60
+
67
–
–
–
→
+
70
–
–
–
128
–
––
–
130
–
––
–
∴
The best estimate for
61
+
67
is 130.
92
90
−
54
–
–
–
→
−
50
–
–
–
38
–
–
–
40
–
–
–
∴
The best estimate for
92
−
54
is 40.
67
70
−
19
–
–
–
→
−
20
–
–
–
48
–
–
–
50
–
–
–
∴
The best estimate for
67
−
19
is 50.
56
60
−
29
–
–
–
→
−
30
–
–
–
27
–
–
–
30
–
–
–
∴
The best estimate for
56
−
29
is 30.
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